<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      var num = 123;
      while (true) {
        var num1 = prompt("请输入一个数字");
        if (num1 > num) {
          alert("WRONG大了");
        } else if (num1 < num) {
          alert("WRONG小了");
        } else {
          alert("RIGHT");
          break;
        }
      }
    </script>
  </body>
</html>
